Carbon packs



Ju y 19, 1932- E. w. M. THOMSON- CARBON PACKJS Filed April 25,, 1931 ywvenlor Patented July 19, 1932 PATENT OFFICE nnwann w. m. momson, or

TORONTO, ONTARIO, OANADA- CARBON PACKS Application filed April 23,

This invention relates to carbon packs used in connection with continuous forms, which packs comprise a carrier or girdle to which the trailing ends of the carbons are connected. The carrier is formed of light flexible material adapted to pass between the platen of a typewriter and the friction creating rolls. The carrier-is provided with shoulders adapted to engage -'a part of the typewriter to limit the movement of the carrier, and thus check further movement ofthe carbon sheets toenable the workwebs to be moved to bringa fresh set of forms into co-operative position with the carbons, after which by reversing the movement of the platen, the carbons with the fresh forms are moved back to position the forms for typing.

In the carbon packs of this type heretofore known, the carbon has usually beenpermanently secured by its sides to the carrier, so that the work webs have to be thread-. ed between the carbon sheets, and when the carbon sheets are worn out the carrier is discarded along with the carbon sheets.

This threading of the work sheets through the pack is a troublesome operation and my object is to devise a construction in which the carbon sheets are detachably connected to the carrier at one side to facilitate the interleaving of the carbons with the work sheets. I prefer, however, to detachably connect the carbon sheets to the carrier at both sides, as I'am thus enabled to use the carrier over and over again and it is possible therefore to provide a carrier ofmore substantial construction as the expense of the carrier is not an important consideration, as the expense. of replacement carriers is largely avoided. i

I attain my object by means of the. constructions hereinafter. described and illus trated. in the accompanying drawing in which Fig. 1 is a side elevation of part of a typewriter illustrating my improved carbon pack in use;

Fig. 2 a plan view of the same showing the method of interleaving the carbon and work sheets;

1931. Serial N0. 532,241;

Fig. 3 a detail illustrating a modified method of securing the carbons in place; and

Fig. 4 a detail illustrating another method of connecting the carbon to the carrier.

In the drawing like numerals of reference indicate corresponding parts in the different figures.

My improved carbon pack comprises a carrier 1 and carbon sheets 2. The carrier is formed of tough flexible material, for example, buckram and to the forward end thereof the carbon sheets 2 are secured. The carbon sheets are provided with extending portions 3 at each side, which extensions are each provided with a pair of holes 4. The carrier is provided at each side with a strap 5, one end of which is preferably permanently secured to the forward part of the carrier, while its other end is detachably connected with the carrier in any suitable manner, such, for example, as by a dome fastener 6. The straps 5 are threaded through the holes 4 and secured in place by the dome fastener.

The carrier 1 may be provided with guides 7 and 8 for the work sheets 9.

' In practice, the work webs are first threaded through the guides 7 and 8 and the first set of forms positioned for interleaving with the carbon sheets. The carbon sheets are secured in place at one side of'the carrier. The carbon sheets are then interleaved with the work webs one by one as illustrated in F ig. 2, and when they are all in place the other strap 5 is threaded through the holes in the other side of the carbons. This arrangement avoids the necessity of staggering the carbons as is common in carbon packs in which the carbons are to the carrier. It will be noted particularly from Fig. 3 of the drawing that the extending portions 3 of the carbon sheets 2 are left uncarbonized. This is for the purpose of preventing dirtying of the fingers and is an important feature particularly in a carbon pack of this type where the individual carbon sheets are handled considerably.

The pack is used in an ordinary manner being moved back and forth relative to the platen as the sets offorms are completed.

permanently secured .The checking of the forward movement of the pack to enable a fresh set of'forms to be brought into co-operative positionwith the carbon sheets is accomplished by the dome fasteners 6, which form shoulders of such thickness that they will not pass between the the straps through the holes. The straps are only threaded through one hole of each pair. It will be evident that the straps may be threaded through the other hole of each pair, and therefore the holes are preferably spaced apart a distance sufficient to cause the lines of typing, when one pair of holes is used, to be midway between the lines of typing when the other pair of holes is used, thus enabling me to get double use of the carbon sheets. In Fig. 4 I show straps 10 of flexible material secured only at their forward ends to the carrier, their rear ends being left free and provided with shoulders 11 adapted to limit the forward movement of the carrier. From the above description, it will be seen that I have deviseda construction which will satisfactorily attain the object of my invention as set forth in this specification. What I claim as my invention is:

1. In a carbon pack for use in the mani folding of continuous forms on a typewriter or similar machine, the combination of a carrier; means on said carrier for limiting its passage through the typewriter; and a carbon sheet hingedly connected at one edge to the carrier, and means for detachably connecting the opposite edge to the carrier.

2. In a carbon pack for use in the manifolding of continuous forms on a typewriter or similar machine, the combination of a carrier; a carbon sheet and means on said carrier for limiting its passage through the typewriter and for detachably connecting the opposite edges of said carbon sheet to the carrier.

3. In a carbon pack for use in the manifolding of continuous forms on a typewriter or similar machine, the combination of a carrier; means on said carrier for limiting its passage through the typewriter including straps extending longitudinally of said carrier and having their forward ends connected therewith, the rear ends being releasably held against the carrier; and a carbon sheet having a hole adjacent each side thereof through which the straps are threaded.

4. In a carbon pack for use in the manifolding of continuous forms on a typewriter or similar machine, the combination of a carrier; straps extending longitudinally of said carrier and having their forward ends connected therewith, the rear ends being releasably held against the carrier, the holding means and the straps forming athickening to limit the passage of the carrier through the typewriter; and a carbon sheet having a hole adjacent each side thereof through which the straps are threaded.

5. In a carbon pack for use in the manifolding of continuous forms on a typewriteror similar machine, the combination of a carrier; straps extending longitudinally of said carrier and having their forward ends connected therewith, interlocking fastening means having one portion on the rear end of said strap and another portion on the carrier; and a carbon sheet having a hole adjacent each side thereof through which the straps are threaded.

6. In a carbon pack for use in the manifolding of continuous forms on a typewriter or similar machine, the combination of a carrier; straps extending longitudinally of said carrier and having their forward ends connected therewith, the rear ends being thickened to limit the travel of the carrier through the typewriter.

7. In a carbon pack for use in the manifolding of continuous forms on a typewriter or similar machine, the combination of a carrier; and a carbon sheet hingedly connected at one edge to the carrier, and means for detachably connecting the opposite edge to the carrier.

8. In a carbon pack for use in the manifolding of continuous forms on a typewriter or similar machine, the combination of a ca rrier; and a carbon sheet hingedly connected at one edge to the carrier, and means for detachably connecting the opposite edge to the carrier, the portion of the carbon sheet adjacent the detachable connection being uncarbonized.

Signed at the city of Toronto, Canada, this 2nd day of April, 1931.

EDWARD W. M. THOMSON. 

